ref: c2b000431f56ed1b2d3d6743218bf037ca5e330e
parent: 4b8913f3390fd6d1b7276de32248fdd3261ed0aa
author: xiaotiansf <xiaotianshimail@gmail.com>
date: Fri Jan 4 11:20:29 EST 2019
Implemented a generic way to prevent the queued decoded B-frame buffers from being overwritten.